Bug Description

Istiod memory and cpu consumption are growing continuously.
% k top po -n istio-system
NAME CPU(cores) MEMORY(bytes)
authservice-0 1m 6Mi
cluster-local-gateway-64f58f66cb-vz2pd 27m 84Mi
istio-egressgateway-5c597cdb77-jdhv6 25m 70Mi
istio-ingressgateway-8d7d49b55-fjvvx 28m 76Mi
istiod-54c54679d7-9559c 2826m 6149Mi

top - 00:46:48 up 14:45, 0 users, load average: 3.43, 2.59, 2.91
Tasks: 5 total, 1 running, 4 sleeping, 0 stopped, 0 zombie
%Cpu(s): 12.9 us, 0.6 sy, 0.0 ni, 85.7 id, 0.0 wa, 0.0 hi, 0.4 si, 0.4 st
MiB Mem : 128845.1 total, 110897.2 free, 8045.7 used, 9902.2 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 119708.5 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 istio-p+ 20 0 10.1g 5.2g 66572 S 165.8 4.1 1413:06 pilot-discovery
39 istio-p+ 20 0 6104 3288 2776 R 0.3 0.0 0:00.01 top
29 istio-p+ 20 0 2616 604 528 S 0.0 0.0 0:00.01 sh
35 istio-p+ 20 0 2616 104 0 S 0.0 0.0 0:00.00 sh
36 istio-p+ 20 0 4248 3552 2952 S 0.0 0.0 0:00.00 bash

Version

k8s version: 1.21.1
istio version: 1.13.3
kubeflow version: 1.5.0

Additional Information

No response